RE: transmission - overdrive light comes on
I hate to tell you Dodge guys this.....but putting a thickener like Lucas in your late model tranny is the absolute WORST thing you can do....I've lost count on how many people net wide have lost trannies that way. You can use seafoam as a pretreat BEFORE a filter change to remove guck and varnish, but not the other way around.
In the "good old days" thickeners or viscosity improvers had some merit as they increased pressures in older trannies. Unfortunatlly in todays modern world...thickeners can actually plug tiny passages and decrease flow. My advice....change the fluid, filter and adjust the bands.
The lining to "lockup" your tranny in OD is actually in the TC. When the factory linings wear thin, the lockup may not occur in the preset time, which after several run cycles, will trigger a code. Replacing the shift selenoid doesn't always help if the linings are worn and slipping. Eventually...you lose overdrive. Good aftermarket convertors actually use a thicker high temp lining to reduce wear and increase lifespan.
OMG..that check valve has gotta go....! That is the #1 destroyer of trannies....a great idea for fussy Mercedes owners who maintain thier cars religously. The valve looks like a large brass fitting on your tranny line just before the radiator tranny cooler.